I know this seems insane to be asking; but my 1 year old calico Freja has been acting strangely in the past couple of days. She's gotten more affectionate and has started this very loud cry that's somewhere between a yowl and a meow, especially at night. She also sometimes reverse arches her back which I've never seen her do. Last night I heard another cat outside making similar yowling noises. She was spayed 2 months ago and the records from the vet say "Routine hysterectomy and bilateral salpingoophorectomy," so I know they took her ovaries too. I just don't get the behavior and I'm scared she's going to break out of my apartment somehow if she's really in heat and theres a tom somewhere trying to woo her.